C# for Loop Statement with Examples

How to Use the for Loop Statement in C#

This tutorial describes how to use the C# for loop statement.
A for loop is a control flow statement that you allow you to execute a block of code repeatedly.

Related C# tutorials:

• C# foreach loop statement
• C# while loop statement

The for Loop Syntax

The syntax of the for loop statement is as follows:

for (initializer; condition; iterator)
{
     //block of code
}

Or if you need to create an infinite for loop, you can use the following syntax:

for ( ; ; )
{
    // Block of code.
}

Examples

Example 1

You can use the for loop statement to loop through an array of numbers and print each number to the console, as the following code shows:

using System;
 
namespace ForLoopExample
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] numbers = new int[]
            {
                1, 10, 9, 8, 7, 4, 5, 3, 2, 6
            };
            for (int i = 0; i < numbers.Length; i++)
            {
                Console.WriteLine(numbers[i]);
            }
        }
 
    }
}

Output:

1
10
9
8
7
4
5
3
2
6

Example 2

The following code is another example that shows you how to use the for loop statement:

using System;
 
namespace ForLoopExample
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] numbers = new int[]
            {
                1, 10, 9, 8, 7, 4, 5, 3, 2, 6
            };
            for (int i = numbers.Length - 1; i > 0; i--)
            {
                Console.WriteLine(numbers[i]);
            }
        }
 
    }
}

Output:

6
2
3
5
4
7
8
9
10

Example 3

The following example shows you how to find the sum of numbers from 1 to 100:

using System;
 
namespace ForLoopExample
{
    class Program
    {
        static void Main(string[] args)
        {
            int total = 0;
            for (int i = 1; i <= 100; i++)
            {
                total += i;
            }
            Console.WriteLine("Total: " + total);
        }
 
    }
}

Output:

Total: 5050

Example 4

The following example shows you how to create an infinite for loop:

using System;
 
namespace ForLoopExample
{
    class Program
    {
        static void Main(string[] args)
        {
            int count = 0;
            for (; ; )
            {
                Console.WriteLine(count);
                if (count == 10)
                {
                    break;
                }
                count++;
            }
        }
 
    }
}

Output:

0
1
2
3
4
5
6
7
8
9
10

The loop breaks when the value of the variable count is equal to 10.

More C# tutorials:

• C# if-else statement
• C# switch-case statement

In this tutorial, you have learned how to use the for loop statement. A for loop is a control flow statement that allows you to execute a block of code repeatedly.